It can be learned from the first paragraph that______.
ART is double-effected
B. HIV science is challenged
C. AIDS research is dishonest
D. AIDS denialism is prevalent
It can be inferred from the last paragraph that the first step in flourishing mail industry is______.
A. to upgrade the delivery service while cut the price down
B. to expand the privileges enjoyed by it
C. to open up mail-delivery market to more companies
D. to compute delivery prices against the labor costs
It can be inferred that the author holds a positive attitude towards______.
A. top scientific journals
B. filter then publish mechanism
C. studies from star scientists
D. open-access megajournals
Toward the prospect of nuclear industry 26 years ago, The Economists attitude can be said
A. objective
B. optimistic
C. pessimistic
D. biased
微信支付 
支付宝支付